Ciocîltan, Virgil. 2003. “The Arabs and the Islam until the 13th Century. II. The Islamic Expansion”. The Annals of "Dunarea De Jos" University of Galati. Fascicle XIX, History 2 (December), 50-65. https://www.gup.ugal.ro/ugaljournals/index.php/history/article/view/956.